Question

1) Classify the hypothesis test as lower-tailed, upper-tailed, or two-sided. A health insurer has determined that the "reasonable and customary" fee for a certain medical procedure is $1200. They suspect that the average fee charged by one particular clinic for this procedure is higher than $1200. The insurer wants to perform a hypothesis test to determine whether their suspicion is correct. Lower-tailed Upper-tailed Two-sided 2) A report states that 56% of homes in Illinois had air conditioning. How large a sample is needed to estimate the true proportion of Illinois homes that have air conditioning to within 3% with 99% confidence? 1817 909 455 O 3634

please help with both, thank you very much!

Answer 1

Solution The null and alternative hypothesis is the Hoi-1200 vs Hil> 1200 Opper toiled 10 2 + m. Es 0.03 Giron p=0.56 Q-001 24- 20:0) = 2.576 from table 15 Margin of emas Zx V PO-P) n 0.03 = 2.576 V0.56()-0-56) n n = 1816.72 n=1817 25 Answer In=1817 o 1817